Grinding machine



FIG. 1 is a front view of the grinding machine according to my invention;

FIG. 2 is a rear view of the grinding machine according to my invention;

FIG. 3 is a view from the right side of the grinding machine according to my invention;

FIG. 4 is a view from the left side of the grinding machine according to my invention;

FIG. 5 is a top view of the grinding machine according to my invention;

FIG. 6 is a bottom view of the grinding machine according to my invention; and,

FIG. 7 is a perspective view of the grinding machine according to my invention. 

The ornamental design for a grinding machine, as shown and described. 